Does a 301 redirect on an entire domain hurt the target domain?

So we bought another forum. We determined that it just isn't worth it to merge their threads over and I planned on setting up a global 301 redirect to the home of our primary forum. However, I don't keep up on SEO as much as others here since it's not a primary revenue stream for me, so I don't know how that will impact the target forum. I know that it hasn't had negative impacts in the past, but that was several updates ago. Are there currently negative impacts to the target domain if another already-established domain is globally 301'd to it?